Screw-pump.



E. S. BENNETT.

SCREW PUMP.

APPLIOATION FILED APB.B, 190s. RENEWED SEPT. 14, 1909.

Patented Mar. 1,1910.

' 2 SHEETS-SHEET 1.

E. S. BENNETT.

SCREW PUMP. APPLICATION FILED APR.8, 190s. RENEWED SEPT. 14; 1909.

950.563. Patented Mar.1,1910.

2 SHEETS-SHEET 2.

UNI ED STATE8 PATENT oE IoE.

ERASTUS s. BENNETT, OF NEW YORK, N. Y., ASSIGNOR 'ro CONTINENTAL ENGIEERING ooMPANY, 0F NEW YORK/N. Y.

I SCREW-PUMP.

Application filed April 6, 1908, Serial No. 425,502. RenewedSeptembenfl, 1909. Serial/F0. 517,747.

To all whomit may concern:

Be it known that I, Ems'ros S. BENNE'rr, citizen of the United States,residing at New York, N. Y., have invented certain new and usefulImprovements in Screw-Pumps, of which the following is a specification.

My invention relates toscrew pumps, and the object/thereof is to securean effective and durable pump and one which may be constructed at lowcost.

The invention consists in the features 0 construction andcombination andarrangement of parts hereinafter described and particularly pointed outin the claims.

The invention is illustrated in the accompanying drawings, in whichFigure-l is a. longitudinal sectional view on line A-'-A of Fig. 2; Fig.2 is a section on line B-B of Fig. 1: Fig. 3 is a section on line CC ofFig. 4:; Fig. 4 is a face view of one of the heads removed; and Fig. 5is a face view of one of the double conduits comniunicating with theheads.

In these drawings 1 is the cylinder of the pump provided with the heads2 and 3, and 4 is the double threaded screw the shaft of which passesthrough stufling boxes 5 in the heads. 6 are the bearings for the saidshaft.

As will be seen the screw is double threaded and of uniform pitch, andthis provides two intaking cutters and two discharging blades. The headsof the cylinder are duplicates of each other, one being used as an inletand the other'as an outlet. Each head is provided with two openings 7and 8 each in the form of an arc of a circle, the outer diameter beingsubstantially that of the inner diameter of the cylinder. Attachedtoeach 'head is a pipe 9 which has an interior web 10 therein whichdivides said pipe into two conduits. Said pipes communicate with theopenings in each head and are adapted to receive the induction anddischarge pipes respectively.

It is thought the operation of the device will be clear from the above.The water enters one of the pipes 9, flows through the are shapedopenings 7 and S in one head anderating at precisely opposite sides, asdo also the two discharging ends. The uniform pitch of the screwprevents loss of. power due to varying pitch or pitches in the samepump. Of course the volume of water dis: charged can be varied bychanging the pitch of the screw, the larger volume being obtained bygreater pitch (within certain limits) of the screw. The force or head aainst which the pump will dischar e can a so be governed by the pitch oft e screw, the greater force being obtained by the lesser pitch (alsowithin limits). Additional force is also imparted by increasing thespeed of the screw, since the water in each thread space acts as apacking-and obstruction to back pressure.

Bythis construction I am able to secure a close cut off (without actualcontact of metal) at either end. The stufling boxes are easy to get at,the journals are well outside and away flOlnllle water. The screw neednot fit closely in the cylinder, that is to say no actual contact of.moving parts is necessary except that of the shaft in its bearings.

In" construction very little machine work is required, the weight andsize of the pump is exceeding small as compared to the volume of waterhandled and for these reasons an exceedingly low cost and obviously verydurable pump is'pr'oduced. None of the force is wasted either byfriction of metal, movement of numerous parts, or through the con?version of the power into centrifugal force to be largely lost inpacking a large body'of water against the inside of a comparativelylarge circular case as in centrifugal pumps. In this case the power isapplied directly to the'water, and :is exerted to push it forward in thedirection intended. or directlytc the discharge. Hence, a given body ofwater can be moved by this pump with much less power than the same canbe moved with any of the pumps in ordinary use.

It will be noted thatthe screw is of the full length of the c sing andacts on what may be termed for convenience a plug ofwatt-r extendingfrom head to head of said casing. The end of the screw at the inlet endhas a shearing or positive cut off action in connection with the surfaceof the head cutting off successively bodies of the water Patented Mar.1, 1910.

from the inletin the successive revolutions only in connection with adouble screw but they serve to prevent whirling or eddy currents of thewater at the inlets and outlets.

I claim as my invention 1. A pump comprising a cylinder having each headprovided with two arc-shaped .openings, and a central opening, a doubleopenings and a central opening, a doublethreaded screw in said cylinderhaving both ends of eacli thread working closely against said arc-shapedopenings, a shaft for the screw passing through the central openings inthe heads, and an inlet and discharge pipe communicating with theopenings in the said heads, each pipe having a central web thereindividin the pipe into two conduits, one of the bla es of said screwbeing displaced in relation to the other blade.

3. A pump comprising a cylinder having openings in one and a rality ofoutlet openings in the other, a-screw within the cylnider. having alurality of threads displaced circumferentially in respect to ea hother, one thread acting in connection with one inlet and outlet whilesimultaneously the other thread acts in connection with the other inletand outlet, the ends of the screw threads working close against thesaidheads, substantially as described.

4. In combination in a pump a casing having a head at each end with aplurality of openings leading through the same, ashaft, a double screwin the casing on the shaft and supply and delivery pipes having divisionwalls therein forming spaces communicating each with one of the openingsin the heads, said supply and delivery pipes being counterparts of eachother and each having an external. bearing for the shaft of the screw,

substantially as described.

In testimony whereot, I atiix my signaturein presence of two witnesses.

ERASTUS S. BENNETIT.

Witnesses:

Mrn'on L. JUSTIN, Cun'rox l). GANSE.

